[PATCH net-next v5 00/10] enic: SR-IOV V2 admin channel and MBOX protocol

[Satish Kharat]

This series adds the admin channel infrastructure and mailbox (MBOX)
protocol needed for V2 SR-IOV support in the enic driver.

The V2 SR-IOV design uses a direct PF-VF communication channel built on
dedicated WQ/RQ/CQ hardware resources and an MSI-X interrupt.

Firmware capability and admin channel infrastructure (patches 1-4):
  - Probe-time firmware feature check for V2 SR-IOV support
  - Admin channel open/close, RQ buffer management, CQ service
    with MSI-X interrupt and NAPI polling

MBOX protocol and VF enable (patches 5-10):
  - MBOX message types, core send/receive, PF and VF handlers
  - V2 SR-IOV enable wiring with admin channel setup
  - V2 VF probe with admin channel and PF registration

This series depends on "enic: SR-IOV V2 resource discovery and VF
type detection" (Series 1), which has been accepted.

Depends-on: 20260401-enic-sriov-v2-prep-v4-0-d5834b2ef1b9@xxxxxxxxx

Signed-off-by: Satish Kharat <satishkh@xxxxxxxxx>
---
Changes in v5:
- Fix DMA-into-freed-memory race: call enic_admin_qp_type_set() before
  disabling RQ/WQ in both error and close paths (patch 3)
- Fix DMA mapping leak: enic_admin_wq_buf_clean() now unmaps and frees
  WQ buffers still held at close time after a send timeout (patch 3)
- Log rate-limited warning on admin RQ refill failure (patch 4)
- Add missing linux/types.h and linux/bits.h includes to enic_mbox.h
  (patch 5)
- Guard mbox_lock/mbox_comp init with mbox_initialized flag to prevent
  re-initialization on sriov_configure re-entry (patch 7)
- Clear VF registered state before sending unregister reply so PF does
  not treat a dead VF as still registered (patch 8)
- Gate VF-facing log messages with net_ratelimit() to prevent malicious
  VF from flooding PF dmesg (patch 8)
- Reject VF port profile requests when V2 SR-IOV is active since
  enic->pp is not reallocated for V2 VFs (patch 9)
- Move enic_sriov_detect_vf_type() before auto-enable check; skip
  probe-time auto-enable for V2 VFs (patch 9)
- Move admin channel close and VF unregister before unregister_netdev()
  in enic_remove() to prevent use-after-free on netdev (patch 10)
- Add comment in enic_reset() documenting that admin channel is not
  recovered after soft reset (patch 10)
- Bypass RES_TYPE_SRIOV_INTR check for V2 VFs in admin channel
  capability detection (patch 10)
- Link to v4: https://patch.msgid.link/20260411-enic-sriov-v2-admin-channel-v2-v4-0-f052326c2a57@xxxxxxxxx

Changes in v4:
- Fix reverse xmas tree variable ordering (patches 1, 6)
- Use kzalloc_obj instead of kzalloc with sizeof (patch 9)
- Add NULL check for pp allocation in V1 SR-IOV disable path (patch 9)
- Link to v3: https://lore.kernel.org/r/20260408-enic-sriov-v2-admin-channel-v2-v3-0-1d4999a03cec@xxxxxxxxx

Changes in v3:
- Use early-return pattern in enic_sriov_detect_vf_type to reduce
  nesting (patch 1) [Breno Leitao]
- Link to v2: https://lore.kernel.org/r/20260408-enic-sriov-v2-admin-channel-v2-v2-0-d05dd3623fd3@xxxxxxxxx

Changes in v2:
- Fix lines exceeding 80 columns (patches 4, 6, 7, 8)
- Add __maybe_unused to enic_sriov_configure and enic_sriov_v2_enable;
  .sriov_configure wiring deferred to a later series after devcmd
  hardening is in place (patch 9)
- Guard probe-time auto-enable to skip V2 VFs (patch 9)
- Link to v1: https://lore.kernel.org/r/20260406-enic-sriov-v2-admin-channel-v2-v1-0-82cc47636a78@xxxxxxxxx

---
Satish Kharat (10):
      enic: verify firmware supports V2 SR-IOV at probe time
      enic: add admin channel open and close for SR-IOV
      enic: add admin RQ buffer management
      enic: add admin CQ service with MSI-X interrupt and NAPI polling
      enic: define MBOX message types and header structures
      enic: add MBOX core send and receive for admin channel
      enic: add MBOX PF handlers for VF register and capability
      enic: add MBOX VF handlers for capability, register and link state
      enic: wire V2 SR-IOV enable with admin channel and MBOX
      enic: add V2 VF probe with admin channel and PF registration

 drivers/net/ethernet/cisco/enic/Makefile      |   3 +-
 drivers/net/ethernet/cisco/enic/enic.h        |  30 +-
 drivers/net/ethernet/cisco/enic/enic_admin.c  | 525 ++++++++++++++++++++++++
 drivers/net/ethernet/cisco/enic/enic_admin.h  |  27 ++
 drivers/net/ethernet/cisco/enic/enic_main.c   | 237 ++++++++++-
 drivers/net/ethernet/cisco/enic/enic_mbox.c   | 569 ++++++++++++++++++++++++++
 drivers/net/ethernet/cisco/enic/enic_mbox.h   |  95 +++++
 drivers/net/ethernet/cisco/enic/enic_pp.c     |   5 +
 drivers/net/ethernet/cisco/enic/enic_res.c    |   4 +-
 drivers/net/ethernet/cisco/enic/vnic_devcmd.h |  11 +
 drivers/net/ethernet/cisco/enic/vnic_enet.h   |   4 +-
 11 files changed, 1495 insertions(+), 15 deletions(-)
---
base-commit: 3e6ef4fb822c971b464d44910a1561b4e7f9efa7
change-id: 20260404-enic-sriov-v2-admin-channel-v2-c0aa3e988833

Best regards,
--  
Satish Kharat <satishkh@xxxxxxxxx>